Get Oak's letter and run across Seabreak path until you are in Flower Paradise and talk to Shaymin battle and Catch it if you like.
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When you come to route 224 (Proffeser Oak wants you to in Oak's letter) you can thank anyone you want. It doesn't matter. After that, shaymin appears, and you chase her down seabreak path. Make sure your Pokemon isn't a high level, though. Shaymin is level 30. Hope this helped! ( P.S: use your bike on seabreak path, it's LONG!)
it was for an event to get shaymin. you need to take Oaks laeter to that part and it will unlok a secret path to get to shaymin..
You wait for an event & talk to the man in the Pokemon center in Floroma town then go to the top of Route 224. Then talk to Prof. Oak & go down Seabreak Path & at the end look around. There you will find the cute Pokemon you know as Shaymin (don't get me wrong, I've done it).
i think you need an action replay but i don't have one soo...
You can find him if you trigger the Shaymin event, where he asks you to write down the name of a trained that inspired you to open Seabreak Path, which leads to Flower Paradise, where you catch Shaymin.